Spin Crossover and Magnetic Properties of Ba-Substituted Cobaltites

The dependence of the properties of the La 0.45 Ba 0.55 CoO 3 – δ and La 0.4 Ba 0.6 CoO 3 – δ cobaltites on the oxygen content has been studied. A decrease in the oxygen content leads to the stabilization of cobalt ions in the 3+ oxidation state and to a transition from a conducting state with posit...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2019-01, Vol.128 (1), p.98-104
Main Authors: Troyanchuk, I. O., Bushinsky, M. V., Sikolenko, V. V., Ritter, C.
Format: Article
Language:English
Subjects:
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
Classical and Quantum Gravitation
Cobalt
COBALT COMPOUNDS
COBALT IONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Crossovers
Cubic lattice
CUBIC LATTICES
Disorder
Electrical resistivity
Elementary Particles
EXCHANGE INTERACTIONS
Ferromagnetism
High temperature
LANTHANUM COMPOUNDS
LATTICE PARAMETERS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
Magnetism
MAGNETIZATION
MAGNETORESISTANCE
Magnetoresistivity
Order
OXIDATION
OXYGEN COMPOUNDS
Oxygen content
Particle and Nuclear Physics
Phase Transition in Condensed System
Physics
Physics and Astronomy
Quantum Field Theory
Relativity Theory
Solid State Physics
SPIN
Temperature dependence
Valence
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Summary:The dependence of the properties of the La 0.45 Ba 0.55 CoO 3 – δ and La 0.4 Ba 0.6 CoO 3 – δ cobaltites on the oxygen content has been studied. A decrease in the oxygen content leads to the stabilization of cobalt ions in the 3+ oxidation state and to a transition from a conducting state with positive exchange interaction to an antiferromagnetic insulating state with a long range magnetic order with decreasing temperature. Application of a magnetic field gradually transforms the antiferromagnetic state to the ferromagnetic one. The cubic lattice parameter is independent of temperature and an anomalous dependence of the magnetization, electrical conductivity, and magnetoresistance is treated within a spin crossover scenario. It is assumed that the high-temperature conducting phase and ferromagnetic clusters correspond to a collective intermediate spin state of cobalt ions, whereas the low-temperature antiferromagnetic phase corresponds to a mixed high-spin/low-spin state.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776119010047